Medical device system comprising a catheter including an elongate tubular member having an inner wall surface defining a lumen extending longitudinally through at least a portion of the tubular member. The medical device also includes an inner stop extending inwardly from the inner wall surface of the tubular member at a distal end section of the catheter and a pusher device insertable into the lumen. The pusher device has a contact surface to abut the inner stop of the tubular member.